I'm pretty sure that, by the book, you can't go higher than 20th level, so any advice is going to rely pretty heavily on however your DM handles advancement past 20th. Do you know what their rules are for that?
Most games don't even get to level 20. There isn't good rules support for going past that.
That said, Fighter would give you more feats and stack with the Magus Fighter Training class feature.
Urban Barbarian would have problems with raging not being compatible with spell combat. It would lack synergy.
Have you looked at Swashbuckler?
Sorcerer for cross-blooded shenanigans. Vigilante also has a lot of good stuff. I'd pass on Barbarian and go Bloodrager instead if that's what you're going for.
Arcanist or Wizard dip, then Eldritch Knight sounds like the best bet.
Maybe Alchemist Vivisectionist? Get some sneak attack, more Int-based "casting," and mutagen buffing.
how so? i thought urban rage allowed you to do things that would normally require conentration
Urban Barbarian would have problems with raging not being compatible with spell combat. It would lack synergy.
It does, but it is debatable whether this includes spellcasting, since it mentions being able to use skills that you can't use with normal rage, but not spellcasting. BUT --
You could get the feat Mad Magic to allow you to cast spells while in Rage (even if from a source other than your own reservoir of Rage, such as the Rage spell). However, this requires you to blow a Rage Power on Moment of Clarity, which is a Rage Power Tax, OR --
Instead of Barbarian you could use Bloodrager, in which case you can get Mad Magic without needing the Moment of Clarity Rage Power.
One question, though: Does your GM use rules for advancing spellcasting beyond 20th level? Because if so, you might just want to add on levels of something that grants +1 level of existing spellcasting class + something else useful. Tacking casting of 7th level spells onto a Magus would be not too shabby. If the answer is no, then you probably want a full BAB class or prestige class -- which one depends upon what you have already been doing.
It is all going to depend on how the GM is handling advancing past 20th. The question that UnArcaneElection asked is only part of the equation. It also matters on how the GM is going to scale up the challenges. Will things spell resistance and saving throws on monsters continue to increase? Do you get more attacks after your BAB goes above 20? Also will the AC and HP of the opponents also scale up?
If the GM is going to increase defenses like saves and spell resistance then you need a way to increase your own abilities. If spell resistance is going increase this could be a huge problem for you. If spell resistance is increasing and the game goes high enough your offensive spells are going to be completely useless. How are you going to overcome a Spell Resistance of 50+ if your caster level is only 20? Since spell resistance becomes a lot more common at higher levels this is going to be very important
If this is the case then you are going to want something that increases your caster level. Even if you don’t get more spells, or higher level spell you will need to keep your cater level maxed out to keep your spell viable. At this point your best option is going to be Eldritch Knight. After that it get harder because most of the prestige classes that advance your caster level every level have ½ BAB.
If the monsters defenses especially spell resistance is not going to go up than ignore everything I wrote.
Assuming that spell resistance is not a problem then you may want to give unchained rogue a look. The reason I am suggesting the unchained rogue is because of skill unlocks. Normally skill unlocks are not that powerful, but some of the 20 rank skill unlocks are actually very good. The problem is that like capstone abilities you rarely if ever get to use them. The nice thing is that they don’t require 20 levels in a class just 20 skill ranks. As a INT based character you will be quickly able get 20 ranks in a skill in only a couple of levels. Once you get to 10th level of unchained rogue you can take the talent cutting edge which gives you 2 extra unlocks. This allows you to quickly get any skill unlocks you want.
The 20 rank skill unlock on intimidate added to a cornugun smash incredibly good.
Just make sure to get greater invisibility to allow you to add sneak attack to every hit.
1 level of oracle (wind) for vortex spells (critical on spell combat staggers target).
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I like Occultist with the Transmutation implement for a Magus, but I have no idea how well it would work post level 20. Chances are you have a Belt of Physical Perfection +6, so the enhancement bonus to a stat isn't as valuable. Legacy Weapon lets you put any enhancement onto your weapon. Not just the limited list from Magus. But again, at that level, you might be running up against the enhancement bonus limit on the weapon anyway.
Alchemist or Investigator would make use of your high Int.
I like the Brawler/Wizard/Eldritch Knight combination, too. May as well go with a Prestige Class at that point for the fun of it.
Yeah- as others have said, knowing your build and how your GM is handling epic levels would help a ton. If he uses the rules found on the d20pfsrd I'd suggest going straight into eldritch knight to improve BAB and continue magus spell progression. If spellcasting is hard capped at 20th it really comes down to your build but a class or classes that up your melee will be more effective than starting a new casting class.
The rules on www.d20pfsrd.com even provide an option for advancing your base class beyond level 20.
Blackblade arcanist, so you can use your magus abilities with the sorcerer spell list as well, then eldritch knight.
Do you get higher level spell -slots-? Because that's when goofiness like quickened disintegrate can show up, plus a full attack.